Forming Bonds While Breaking Old Ones: Isomer-Dependent Formation of H 3 O + from Aminobenzoic Acid During X-ray-Induced Fragmentation
- Nano and Molecular Systems Research Unit, University of Oulu, 90570 Oulu, Finland, Molecular and Condensed Matter Physics, Uppsala University, 75120 Uppsala, Sweden
- Nano and Molecular Systems Research Unit, University of Oulu, 90570 Oulu, Finland
- Nano and Molecular Systems Research Unit, University of Oulu, 90570 Oulu, Finland, MAX IV Laboratory, Lund University, 22100 Lund, Sweden
- Molecular and Condensed Matter Physics, Uppsala University, 75120 Uppsala, Sweden
Intramolecular hydrogen transfer, a reaction where donor and acceptor sites of a hydrogen atom are part of the same molecule, is a ubiquitous reaction in biochemistry and organic synthesis. In this work, we report hydronium ion (H3O+) production from aminobenzoic acid (ABA) after core-level ionization with soft X-ray synchrotron radiation. The formation of H3O+ during the fragmentation requires that at least two hydrogen atoms migrate to one of the oxygen atoms within the molecule. The comparison of two structural isomers, ortho- and meta-ABA, revealed that the production of H3O+ depends strongly on the structure of the molecule, the ortho-isomer being much more prone to produce H3O+. The isomer-dependency suggests that the amine group acts as a donor in the hydrogen transfer process. In the case of ortho-ABA, detailed H3O+ production pathways were investigated using photoelectron-photoion-photoion coincidence (PEPIPICO) spectroscopy. It was found that H3O+ can result from a direct two-body dissociation but also from sequential fragmentation processes.
- Research Organization:
- Univ. of Chicago, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; Swedish Research Council (SRC); Swedish Governmental Agency for Innovation Systems; Formas; Marie Skłodowska-Curie I4Future; EU Framework Programme for Research and Innovation Horizon 2020
- Grant/Contract Number:
- DEAC02-06CH11357; AC02-06CH11357; 2018-07152; 730872; 2018-04969; 2019-02496; 713606
- OSTI ID:
- 1923723
- Alternate ID(s):
- OSTI ID: 1957494
- Journal Information:
- Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory, Journal Name: Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory Vol. 127 Journal Issue: 6; ISSN 1089-5639
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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